docs: def _update_plot(self, _):
          """Callback to redraw the plot to reflect the new parameter values."""
          # Since all sliders call this same callback without saying who they are
          # I need to update the values for all parameters. This can be
          # circumvented by creating a seperate callback function for each
          # parameter.
          for param in self.model.params:
              param.value = self._sliders[param].val
          for indep_var, dep_var in self._projections:
              self._update_specific_plot(indep_var, dep_var)